table copy function falling short in a big way

Using version 4 & also version 5 preview 1 of the Azure Storage Explorer, I found the "Copy Table" functionality to be something other than what I had thought it would be.

I needed a way to replicate a table for archival purposes. An export would work for that purpose, but I needed the data to remain in a table on the storage account. When I did my test on a table with 17,420 entities, I ended up with a destination
table containing 30 entities.

Call me nuts but I think there's a major breakdown somewhere with that functionality.